onodrim

There's already a lot of great advice here, but the best thing you can do is continue to encourage her. When you're together continually tell her how beautiful she is, how much she turns you on, etc. I'm sure that will help her start to feel more confident. (Not that you don't already I'm sure. ) In terms of "stretching things out," unless there is a serious physical issue this is the least of your worries. Like others have said, vaginas are made to stretch, they'll do their job when needed! As always, start things slow and small (fingers) and gradually work up until she's comfortable. Look into getting some good lube as well, being too dry can cause a lot of pain and also hinder penetration.

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"The world is so exquisite with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there’s little good evidence. Far better it seems to me, in our vulnerability, is to look death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides"
-Carl Sagan